Heat-pump system with multiway valve

A heat-pump system comprising:

• an outdoor heat exchanger;
• an expansion device in fluid communication with the outdoor heat exchanger;
• an indoor heat exchanger in fluid communication with the expansion device;
• a compressor circulating working fluid through the indoor and outdoor heat exchangers;
• and
• a multiway valve movable between a first position corresponding to a cooling mode of the heat-pump system, a second position corresponding to a heating mode of the heat-pump system, and a third position corresponding to an isolation mode of the heat-pump system,
• wherein working fluid flows in the same direction through the outdoor heat exchanger in the cooling mode and in the heating mode, and wherein working fluid flows in the same direction through the indoor heat exchanger in the cooling mode and in the heating mode, and
• wherein when the heat-pump system is in the isolation mode:
• (i) the multiway valve fluidly isolates the indoor heat exchanger from the compressor and the outdoor heat exchanger, (ii) the multiway valve fluidly isolates the outdoor heat exchanger from the compressor, and (iii) the compressor is off.